What causes a volcanic eruption? | Natural Disasters?

A volcano erupts when pressure builds up inside Earth and then suddenly escapes.

Imagine a soda bottle, it's sealed tight, but if you shake it up, gas and bubbles form inside. When you open the lid, whoosh!, all that fizzy stuff comes rushing out. A volcano works kind of like that.

Inside Earth, there are molten rocks (like really hot lava) and gas trapped deep underground. These things push against the rock around them, just like bubbles pushing up in a soda bottle.

When the pressure gets too big, like when you shake that soda bottle really hard, the top of the volcano cracks open, and everything inside rushes out as an eruption! That’s how volcanoes "blow their tops", not with magic, but with pressure and hot stuff coming up from deep down.